Emoji.js

emojiToUnicode=function (str){
var emojiRegexp = /([\uE000-\uF8FF]|\uD83C[\uDC00-\uDFFF]|\uD83D[\uDC00-\uDFFF]|[\u2694-\u2697]|\uD83E[\uDD10-\uDD5D])/g;
   if(!str)
      return;
   try{
      var new_str= str.match(emojiRegexp);
      for(var emoj in new_str){
      var emojmessage = new_str[emoj];
      var index = str.indexOf(emojmessage);
      if(index === -1)
      continue;
      emojmessage = "\\u" + emojmessage.charCodeAt(0).toString(16) +    "\\u" + emojmessage.charCodeAt(1).toString(16);
      str = str.substr(0, index) + emojmessage + str.substr(index + 2);
    }
    return str;
    }catch(err){
      console.error("error in emojiToUnicode"+err.stack);
    }
};